-6.56% is the change from 899 to 840
Calculation steps:
[( 840 - 899 ) ÷ 899] x 100 = -6.56%
Formula
Percentage change = [(840 - 899) / 899] x 100
Subtract the new number by the original number
840 - 899 = -59
-59 ÷ 899 = -0.06562847608453838
-0.06562847608453838 x 100 = -6.56%